The process of delivery of Russian S-400 missile systems to Turkey is ongoing without any delays, Turkish President Recep Tayyip Erdogan said on Saturday, adding that the bilateral agreement on joint missile building and transfer of technologies was very important for Ankara.

“We continue to observe the process of delivery of S-400 systems with regard to our agreement reached in Dushanbe. I would also like to note that joint missile building, including the transfer of technologies, is a priority for our cooperation. As far as I understand, there are no delays in the process of this delivery,” Erdogan said during his meeting with Russian President Vladimir Putin on the sidelines of the G20 summit in Japan’s Osaka.

In 2017, Moscow and Ankara signed an agreement for the delivery of the S-400 systems. However, this move angered Washington, as, according to the US, the systems might be incompatible with NATO standards. Washington and its allies urged Ankara not to install the S-400 system, warning that otherwise, the US will stop Turkish forces from flying and developing its F-35 jets.

Turkish President Tayyip Erdogan then said that Ankara will proceed with the military equipment purchase despite the concerns of allies.